Grinding machine



April 18, 1933. c. G. HUNT GR\INDING MACHINE Filed May 25 1931 3 Sheets-Sheet l Gttornclj April 18, 1933. c. G. HUNT GRINDING MACHINE Filed May 25, 1951 s Sheets-Slieet 2 v Invcntor 102%56340/7/ HHINH I' Gttorucg April 18, 1933. c. G. HUNT 4 GRINDING MACHINE Filed ma 25, 19:1 3 Sheets-Sheet a 3nventor I I @fsQ/W/W q f u (Ittorneg Patented Apr. 18, 1933 v UNITED STATES PATENT- OFFICE CHARLES G. HUNT, OF CINCINNATI, OHIO, ASSIGNOR TO CINCINNATI GRINDERS INCORPORATED, OF CINCINNATI,

OHIO, A CORPORATION OF OHIO.

GRINDING MACHINE Application filed May 25,

chine having a plurality of grinding wheels for grinding simultaneously a plurality of diameters or portions on the work.

Another object of the invention is the provision of improved means for adjusting the grinding wheels and work relative to 6-6 of Figure 1.

one another prior to inserting the work in and removing same from the machine to avoid interference between the grinding wheels and work during said loading and unloading of the work.

Another object of the invention is the provision of improved means for axially adjusting a grinding wheel spindle and the wheel or wheels carried thereby relative-to the bearings of the spindle.

Other objects and advantages of the present invention should be readily apparent by reference to the following specification considered in conjunction with the accompanying drawings and it is to be understood that any modifications. may be made in the exact structural details there shown and described, within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

In the drawings:

Figure '1 is a front elevation of a grinding machine embodying the improvements of this invention.

Figure 2 is a rear elevation of the machine shown in Figure 1.

Figure 3 is a vertical sectional view taken on line 3-3 of Figure 2.

Figure 4 is a fragmentary sectional view taken on line 44 of Figure 2.

Figure 5 is a fragmentary end elevation of the machine shown in Figures 1 and 2 as seen from line 5-5 of Figure 1..

Figure 6 is a sectional View taken on line Figure 7 is a transverse sectional view through the mechanism for positioning the work loading and ejecting bracket relative to its support.

1931. Serial No'. 539,667

Throughout the several views of the drawi ings similar reference characters are employed to denote the same or similar parts.

A device embodying this invention may comprise a bed 10 having rising therefrom the pedestal 11 supporting the bearings 12 for a spindle 13 to the forward end of which is secured a plurality of grinding wheels 14. Opposed to the grinding wheels 14 are a plurality of regulating wheels 15 mounted on a spindle 16 journaled in suitable bearings carried by the housing 17 terminating in a slide 18. The slide 18 is superimposed upon a second slide 19 supported and guided by ways -20 formed on the bed 10. The forward end of the slide 19 has adjustably secured thereto for transverse adjustment a block 21 for the work rest blade 22 which peripherally engages. and supports the work 23 within the grinding throat formed between the proximate points of the grinding and regulating wheels.

The slides 18 and 19 are adapted to be actuated toward and from the grinding wheel for initially adjusting the size of the grinding throat, as well as effecting a relative feed between the work 23 and the grinding wheels 14. For this purpose the housing 17 of the regulating wheels 15 has oscillatably mounted therein a nut 24 in threaded engagement with an adjusting screw 25 journaled at its outer end in a bracket 26 supported by the bed 10. For rotating the screw relative to the nut 24 it has secured thereto exteriorly of the bracket 26 a pilot or hand wheel 27. In order that the slides may be moved independently of one another, as well as, as a unit there are provided clamps 28 and 29, the latter for securing the lower slide to the bed and the former for securing the slides to one another. I v

The work piece 23, as seen in Figure 3, has a plurality of portions SOand 30a to be operated upon by the grinding wheels 14 and the work has a flange 31 between-said por-.

This mechanism comprises a bracket 32 ing enclosing the grinding wheels 14. The bracket 32 has formed integral therewith or secured thereto a cylinder 36 having in-take and exhaust ports 37 and 38 adapted to alternately admit pressure to the opposite ends of the cylinder 36. Within the said cylinder 36 is a piston 39 from which piston rod 40 extends being secured as at 41 to a work carrier 42. The said work carrier 42 consists of a transverse bar 43 from which arms 44 and 45 extend. The arm 44 has secured thereto an abutment plate 46 abutting with one end of the work 23 and a pin 47 extends from the said plate 46 and is received in a bore in the work for supporting the end thereof contacting the plate 46. The arm 45 is provided with inclined supports 48 upon which the adjacent end of the work lies and by which the work is centralized.

To guide the work carrier from the work receivmg position outside of .the grinding throat to the position for placing t e wor on the blade 22 it has extending from it guide bars 49 and 50 respectively slidably received in bearings 51 and 52 integral with or secured to the bracket 32.

To adjust the bracket longitudinally of the face 34 there is provided an adjusting screw 53 rotatably journaled in a' bearing 54 formed integral with the grinding wheel housing 35. The threaded end. of said screw is received in a nut 55 rotatably j ournaled in a bearing 56 formed integral with the bracket 32. Secured to or inte ral with the nut 55 is a worm wheel 57 mes ing with a worm 58 on worm shaft 59. A hand Wheel 60, see Figure 1, is secured to the worm shaft 59 exteriorly of the housing 54 within convenient reach of the operator for adjusting the said shaft and bracket. This adjustment is made necessary at the time of truing the faces of the wheels 14 or as the wheel wears in order that the proper clearance is at all times maintained between the wheels and work.

The work is further provided with shoulders 61 and 62 flanking the portion 30 of the work and with shoulder 63 at one end of the work portion 30a which are adapted to be ground by the grinding wheels 14. In order that inadvertent engagement between said shoulders of .the wlork and the wheels is not had the grinding wheels and their spindle are adapted to be axially adjusted to insure the proper clearance. For this pur ose there is provided on the forward face 0 the bed 10 a handle 64 secured to the forward end of a transverse shaft 65. This shaft 65 is journaled in its forward end in a bracket 66 secured to the face of the bed and carriesat its upper end a latch plate 67 cooperating with spring pressed latch 68 extending through the lever 64. The rear end of the shaft 65 has keyed to it a sprocket 69 about which is trained a sprocket chain 70 in turn, trained about idler sprocket 71 and sprocket nut 72.. As seen in Figure 4, the sprocket nut 72 is mounted between thrust bearings 73 and 74 to prevent movement thereof axially of itself. The said thrust bearings are between the portions 75 and 76 of a housing secured to the sliding thrust bearing casing 77. The sprocket nut 72 has threaded engagement with a short screw 78 secured'as at 7 9 to a cap plate 80 secured by any desirable means to the end of cup 81 in which is mounted the thrust bearing 82 secured to the spindle extension 83 b a nut 84. The cup 81 is provided with a eyway has been reduced to the desired size the latch 68 is depressed through the thumb piece 87' and the handle 64 oscillated first in one direction and then in the other direction to eflect a traversing of the grinding wheels relative to the portions 30 and 30a and to effect the grinding of the shoulders 61, 62 and 63.

After the work pieceohas been positioned on the work rest blade 22 and to effect a relative feed between it and the grinding wheel resort is had to the in-feed lever 88 secured to.the oscillatable nut 24 at which time the screw 25 is held stationary so that oscillation of the nut relative to the screw effects an advancement of the slides 18 and 19 'and a relative feeding of the work and grinding wheels.

The placing of the work piece on the blade and the removal thereof from the blade is most desirably automatically eflected for which purpose there is secured to the end of the regulating wheel housing 17 a suitable valve 89 having secured to the stem 90 thereof an actuator 91.. The actuator 91 is bifurcated to provide arms 92 and 93 adapted to cooperate with a pin 94 extending from the inner faces of the lever 88. As shown in Figure 6, the valve has extending therefrom four conduits 95, 96, 97 and 98 respectively extending to the pump or pressure, the bottom port 38 of the cylinder 36, the reservoir or sump and the top port 37 of the cylinder. The valve plug 99 is provided with a pair. of arcuate slots or ports duits 95 and 98 and 96 and 97 when in a secthe work piece would not be within the grinding throat but would be at the upper limit of travel of the work carrier which would place the piston 39 adjacent the top port 37. A work piece is now placed on the work carrying arms 44 and 45 whereupon the bandie 88 is oscillated in a counter clockwise direction through substantially 90 and returned. At the commencement of the movement of the lever 88 it would, through the pin 94 and engaging the arm-92 of actuator 91, rotate the valve body or plug 99 from the position shown in Figure 6-to connect the conduits 95 and 98 through theport 100 and connect conduits 96 and 97 through the port 101. This would cause the piston 39 to descend through the cylinder 36thereby placing the work carried by the arms 44 and 45 within the grinding throat whereupon continued movement of the handle 88 would feed the work into the grinding wheels to the desired depth. At this time the handle 64 would be grasped and oscillated first in one direction as respects the center and then in the other direction thereby traversing the grinding wheels relative to the portions 30 and 30a of the work. At the conclusion of the grinding operation the handlev88 is oscillated in a clockwise direction to the posi tion shown in Figure 5, near the end of its movement the pin 94 would pick up the actu ator 91 through the interengagement thereof with the arm 93 and would return the valve body 99 to the position shown in Figure 6 whereupon the pressure in conduit 95 would be directed into the conduit 96 for. effecting a vertical movement of the piston relative to the cylinder 36 and withdrawing the work from the grinding throat.

What is claimed is:

1. In a grindingmachine the combination of a head, a spindle rotatably journal'ed and axially shiftable therein, a grinding wheel carried by the spindle, a screw on the end of the spindle adapted to' axially shift and shift with the spindle but held against rotation, means operable on the screw for effecting the axial shifting thereof, said means comprising a rotatable nut fixed against axial movement, and means for rotating the nut including a sprocket having trained thereabout a sprocket chain, and means for actuating the sprocket chain. 1

2. In a grinding machine the combination of a bed, a wheel head supported thereby, a

spindle ournal ed in the wheel head for r0-,

tative and axial movement, a thrust bearing includin a housing therefor on one end of the spin 1e, meanscarried by the head cooperating with the bearing housing to prevent rotative movement of the housing, a screw extending from the bearing "housing, a nut in threaded engagement therewith, means for rotating the nut and effecting axial adjustment of the spindle, said means includ ing a gear on the nut, a sprocket chain around the gear, a' driving sprocket pinion, and means for actuating the driving sprocket.

3. In a grind-ing machine the combination of a bed, a wheel head supported thereby,

a spindle journaled in the wheel head for r0 tative and axial movement, a thrust bearing including a housing therefor on one end of the spindle, means carried by the head cooperating with the bearing housing to prevent rotative movement of the housing, a screw extendingfrom the bearing housing, a nut in threaded engagement therewith, means for rotating the nut and effecting axial adjustment of the. spindle, said means including a gear on the nut, a sprocket chain around the gear, a driving sprocket pinion, means for actuatingthe driving sprocket including a shaft, amanually actuable lever on the shaft, and a locking plate cooperating with a spring pressed plunger on the lever for locking the shaft and spindle against actuation. 4. In a centerless grinder the combination of a bed, a pair of opposed grinding and 1 egulating wheels formmg a grinding throat therebetween, a work support within the grinding throat adapted to support a work piece in operative engagement with the grinding and regulating wheels, a-housing for the grinding wheel, a loading and ejecting mechanism supported by the housing for placing on and removing work' pieces from the work support, and hydraulically actuable means for operating the loading and ejecting mechanism.

5. In a centerless grinder the combination of a bed, a work support carried by the bed, a. regulatin wheel on one side of the work support, a p urality of grinding wheels on the other side of the work support opposed to the regulating wheel, a spindle for the grinding wheels, a head supporting the grinding wheel spindle, the grinding wheels being spaced from one another and adapted to operate on spaced portions of the work which has an enlarged portion adapted to enter. the space between adjacent grinding wheels, and means for axially adjusting the spindle relative to the head to align the space between the grinding wheels with the enlarged portion of the work.

6. In a centerless grinder the combination of a bed, a work support carried by the bed,

a regulatingwheel on one side of the work support, a plurality of grinding wheelson the other side of the workwsupport opposed to the regulating wheel, a spindle for the grinding wheels, a head supporting the grinding wheel spindle, the grinding wheels being spaced from one another and adapted to operate on spaced portions of the work which has an enlarged portion adapted to enter the space between adjacent grinding wheels, means for axially adjusting the spindle relative to the head to align the space between the grinding wheels with ,the enlarged portion of the work and a loading and ejecting mechanism carned by the wheel head for placin work pieces on and removing same from t e work support.

7. In a centerless grinder the combination of a bed, a work support carried by the bed, .a regulating wheel on one side of the work support, a plurality of grinding wheels on the other side of the work support 0 posed to the regulating wheel, a spindle or the grinding wheels, a head supporting the grinding wheel spindle, the grinding wheels being spaced from one another and adapted to operate on spaced portions of the work which has an enlarged portion adapted to enter the space between adjacent grinding wheels, means for axially adjusting the spindle relative to the head to align the space between the grinding wheels with the enlarged portion of the work, a loading-and ejecting mechanism carried by the wheel head for placing work pieces on and removin same fron'i-the work support, and hydraulicallv actuable means for actuating the work loading and ejecting mechanism.

8. In a centerless grinder the combination of a bed, a work support carried by the bed, a regulating wheel on one side of the work support, a plurality of grinding wheels on the other side of the work support opposed to the regulating wheel, a spindle for the grinding Wheels, a head supporting the rinding wheel spindle, the grinding whee being spaced from one another and adapted to operate on spaced portions of the work which has an enlarged portion adapted to enter the space between adjacent grinding wheels, means for axially adjusting the spindle relative to thehead to ali the space between the grinding wheels with the enlarged portion of the work, a loading and ejecting mechanism'carried by the wheel head for placmg work pieces on and removing same from the work support, hydraulically actuable me ans for actuating the work loading and e ecting mechanism, and means for adjusting the position of the loading and ejecting mechanism relative to the head.

9. In a centerless grinder the combination of a bed, a air. of opposed inding and regulating w eels carried there y. and forming a grinding throat therebetween, a work rest blade within the grinding throat, means for varying the relationship between. the

grinding wheel, work support and regulating wheel, a loading and ejecting mechanism for placing a work piece on the support and removing same therefrom, and means for adjusting said mechanism with relation to the work support to maintain the proper operative relation therebetween. i

10. In a centerless grinder the combination of a bed, opposed grinding and regulating wheels carrled thereby and vforming'a grinding throat therebetween, a work rest blade within the grinding throat, a housing enclosing one of the wheels, a slide formed on the housing, a bracket on the slide for movement relative to the housing, means associated with the bracket for movement relative thereto for lowering a work piece on to the work rest blade and removing same therefrom-,and means for adjusting the bracket relative to the housing.

11. In a centerless grinder the combination of a bed, opposed grinding and regulating wheels carried thereby and forming a nding throat therebetween, a work rest i lade within the grinding throat, a housing enclosing'one of the wheels, a slide formed on the housing, a bracket on the slide for movement relative to the housing, means associated with the bracket for movement relative thereto for lowering a work piece on to the work rest blade and removing same therefrom, and means for adjusting the bracket relative to the housing including a screw carried by the housing, a nut in threaded engagement with the screw and carried by'the bracket, and means for rotating the nut relative -to the screw for thereby adjusting the position of the bracket relative to the housing. I

12. In a centerless grinder the combination of a bed, opposed grinding and regulating wheels carried thereby and forming a grinding throat therebetween, a .work rest blade within the grinding throat, a housing enclosing one of the wheels, a slide formed on the housing, a bracket on the slide for movement relative to the housing, means. associated with the bracket for movement relative there- 'to for lowering a work piece on to the work rest blade and removing same therefrom, and means for adjusting the bracket relative to the housing, said work lowering and raising means comprising a cylinder secured to the bracket, a piston within the cylinder, a work carrying frame carried by the piston, and guide members carried by the frame and bracket.

13. In a centerless grinder the combination of a bed, opposed grinding and regulating wheels carried by the bed and forming a grinding throat therebetween, a housing enclosing one of said wheels, a work loading and ejecting mechanism mounted on said housing,

hydraulic means for efiecting actuation of said loading and ejecting mechanism, means for adjusting the position of the loading and ejecting mechanism relative to the housing, means for feeding one of the Wheels relative to the other to efl'ect stock removal from the Work, and means operating said feeding mechanism in sequence With the loading and ejecting means. 4

In testimony whereof-I affix my signature.

CHARLES -Gr. HUNT. 

